May be of interest to anyone in the Denver-metro area interested in USGS

More info on the Paradox Basin :

Enjoy the day,

Emily C. Wild
Librarian (Physical Scientist)
U.S. Geological Survey, Denver Library
Denver Federal Center
ph: (303) 236-1003
[log in to unmask]

USGS Library:

Staff Page: *

---------- Forwarded message ----------
From: SIPES Denver Chapter
Date: Tue, Jun 13, 2017 at 10:19 AM
Subject: S.I.P.E.S. June 2017 Meeting Announcement
To: [log in to unmask]

*Society of Independent Professional Earth Scientists*

*THURSDAY - June 22, 2017*
*Paul G. Lillis*

*“The Chuar Petroleum System, Arizona and Utah”*

*All participants MUST RSVP!!*

RSVP by 11:30 a.m. Monday June 19th
*call 303-730-2967*

*When:* *Thursday, June 22, 2017* ~ 11:30 a.m. - 1:30 p.m.
*Where:* Wynkoop Brewery
- 1634
18th Street, Denver, CO 80202

*Cost Structure:*
        - Members $20 (Presentation & Meal)
        - Non-members $25 (Presentation & Meal)
        - Walk-in $5 (Presentation only)

Cash or Check gladly accepted, regretfully no Credit Cards…

*RSVP by 11:30 a.m. Monday June 19th*

***Please feel free to share this with any friends and colleagues whomight
be interested***

*“The Chuar Petroleum System, Arizona and Utah”*
The Neoproterozoic Chuar Group consists of marine mudstone, sandstone and
dolomitic strata divided into the Galeros and Kwagunt Formations, and is
exposed only in the eastern Grand Canyon, Arizona. Research by the U.S.
Geological Survey (USGS) in the late 1980s identified strata within the
group to be possible petroleum source rocks, and in particular the Walcott
Member of the Kwagunt Formation. Industry interest in a Chuar oil play led
to several exploratory wells drilled in the 1990s in southern Utah and
northern Arizona to test the overlying Cambrian Tapeats Sandstone
reservoir, and confirm the existence of the Chuar in subcrop. USGS
geochemical analyses of Tapeats oil shows in two wells have been
tentatively correlated to Chuar bitumen extracts. Distribution of the Chuar
in the subsurface is poorly constrained with only five well penetrations,
but recently published gravity/aeromagnetic interpretations provide further
insight into the Chuar subcrop distribution. The Chuar petroleum system was
reexamined as part of the USGS Paradox Basin resource assessment in 2011. A
map was constructed to delineate the Chuar petroleum system that
encompasses the projected Chuar source rock distribution and all oil shows
in the Tapeats Sandstone, assuming that the Chuar is the most likely source
for such oil shows. Two hypothetical plays were recognized but not
assessed: (1) a conventional play with a Chuar source and Tapeats
reservoir, and (2) an unconventional play with a Chuar source and
reservoir. The conventional play has been discouraging because most surface
structures have been tested by drilling with minimal petroleum shows, and
there is some evidence that petroleum may have been flushed by CO2 from
Tertiary volcanism. The unconventional play is untested and remains
promising even though the subcrop distribution of source facies within the
Chuar Group is largely unknown.

*Our Presenter*
*Paul G. Lillis*
Paul Lillis is a petroleum geochemist with the Central Energy Resources
Science Center of the U.S. Geological Survey (USGS) in Denver, Colorado. He
received a B.A. in geology from San Jose State University, an M.S. in
geology from San Diego State University, and a Ph.D. in geochemistry from
Colorado School of Mines. He was a petroleum exploration geologist with
Atlantic Richfield for eight years (1978 to 1986) in Colorado, California,
and Texas, and has been with the USGS in Denver since 1987. His research
focuses on the application of petroleum and source-rock geochemistry to
identifying, characterizing, and mapping petroleum systems.
*Copyright © 2017 SIPES, All rights reserved.*
SIPES Denver Chapter

*Our mailing address is:*
PO Box 3786
Centennial, CO 80161